Dulmar guud oo ku saabsan laysarka garaaca wadnaha

Dulmar guudlaysarka garaaca leh

Habka ugu tooska ah ee loo abuurolaysargaraaca wadnaha waa in lagu daro modulator dibadda laser-ka joogtada ah. Habkani wuxuu soo saari karaa garaaca wadnaha ee picosecond ugu dhaqsaha badan, inkastoo uu fudud yahay, laakiin tamarta iftiinka qashinka ah iyo awoodda ugu sarreysa ma dhaafi karaan awoodda iftiinka joogtada ah. Sidaa darteed, hab ka hufan oo lagu soo saaro garaaca laysarka waa in lagu beddelo godka laysarka, lagu keydiyo tamarta waqtiga ka baxsan tareenka garaaca wadnaha oo lagu sii daayo waqtigii loogu talagalay. Afarta farsamo ee caadiga ah ee loo isticmaalo in lagu soo saaro garaaca wadnaha iyada oo loo marayo isbeddelka godka laysarka waa beddelidda faa'iidada, beddelidda Q (beddelidda khasaaraha), faaruqinta godka, iyo qufulka qaabka.

Beddelka faa'iidada wuxuu dhaliyaa garaacyo gaaban isagoo wax ka beddelaya awoodda bamka. Tusaale ahaan, laysarka gaabin-beddelka semiconductor-ka waxay soo saari karaan garaacyo laga bilaabo dhowr nanoseconds ilaa boqol picoseconds iyadoo la adeegsanayo habaynta hadda jirta. Inkasta oo tamarta garaaca ay yar tahay, habkani aad ayuu u dabacsan yahay, sida bixinta soo noqnoqoshada ku celcelinta la hagaajin karo iyo ballaca garaaca. Sannadkii 2018, cilmi-baarayaal ka tirsan Jaamacadda Tokyo ayaa soo sheegay laysarka semiconductor-ka ee femtosecond gain-switched, taasoo ka dhigan horumar laga gaaray caqabad farsamo oo 40 sano socotay.

Garaacyada nanosecond ee xooggan guud ahaan waxaa dhaliya laysarka Q-switched, kuwaas oo lagu sii daayo dhowr safar oo wareeg ah oo ku jira godka, tamarta garaaca wadnahana waxay ku jirtaa inta u dhaxaysa dhowr millijoules ilaa dhowr joules, iyadoo ku xiran cabbirka nidaamka. Tamarta dhexdhexaadka ah (guud ahaan ka hooseysa 1 μJ) garaacyada picosecond iyo femtosecond waxaa inta badan dhaliya laysarka qaabka xiran. Waxaa jira hal ama in ka badan garaacyo ultrashort ah oo ku jira resonator-ka laysarka kaas oo si joogto ah u wareega. Garaac kasta oo gudaha ah wuxuu gudbiyaa garaac iyada oo loo marayo muraayadda isku-xidhka wax soo saarka, dib-u-celinta guud ahaan waxay u dhaxaysaa 10 MHz iyo 100 GHz. Jaantuska hoose wuxuu muujinayaa kala-firdhinta caadiga ah (ANDi) ee kala-firdhinta femtosecond.qalabka laysarka fiber-ka, kuwaas oo intooda badan lagu dhisi karo iyadoo la isticmaalayo qaybaha caadiga ah ee Thorlabs (fiber, muraayad, meesha lagu rakibayo iyo miiska barokaca).

Farsamada faaruqinta godadka ayaa loo isticmaali karaaLeysarrada Q-switchedsi loo helo garaacyo gaagaaban iyo laysarro qaabaysan si loo kordhiyo tamarta garaaca iyadoo dib-u-soo-noqoshada hoose ay hooseyso.

Wareegyada domain-ka waqtiga iyo soo noqnoqoshada
Qaabka toosan ee garaaca wadnaha oo leh waqti guud ahaan waa mid fudud waxaana lagu muujin karaa hawlaha Gaussian iyo sech². Waqtiga garaaca wadnaha (sidoo kale loo yaqaan ballaca garaaca wadnaha) waxaa inta badan lagu muujiyaa qiimaha ballaca dhererka badhkiisa (FWHM), taas oo ah, ballaca uu ku dhex jiro awoodda indhaha ugu yaraan kala bar awoodda ugu sarreysa; laysarka Q-switched wuxuu soo saaraa garaacyo gaagaaban oo nanosecond ah iyada oo loo marayo
Laysar-yada qaabka xiran waxay soo saaraan garaacyo aad u gaaban (USP) oo u dhexeeya tobanaan ilbiriqsi oo picoseconds ah ilaa femtoseconds. Qalabka elektaroonigga ah ee xawaaraha sare leh wuxuu cabbiri karaa oo keliya tobanaan ilbiriqsi oo picoseconds ah, garaacyada gaagaabanna waxaa lagu cabbiri karaa oo keliya teknoolojiyada indhaha oo keliya sida autocorrelators, FROG iyo CARRUURTA. Iyadoo garaacyada nanosecond ama kuwa ka dheer ay si dhib yar u beddelaan ballaca garaacooda marka ay safrayaan, xitaa masaafada dheer, garaacyada aadka u gaaban waxaa saameyn kara arrimo kala duwan:

Kala firdhisku wuxuu keeni karaa ballaarinta garaaca wadnaha oo weyn, laakiin waxaa dib loogu cadaadin karaa kala firdhinta ka soo horjeeda. Jaantuska soo socda wuxuu muujinayaa sida kombaresarada garaaca wadnaha ee Thorlabs femtosecond ay u magdhabto kala firdhinta mikroskoobka.

Caadiyan aan toosnayn guud ahaan si toos ah uma saamayso ballaca garaaca, laakiin waxay ballaadhisaa ballaca, taasoo ka dhigaysa garaaca mid u nugul kala firdhinta inta lagu jiro faafinta. Nooc kasta oo faybar ah, oo ay ku jiraan warbaahinta kale ee faa'iidada leh ee leh ballaca xaddidan, waxay saameyn kartaa qaabka ballaca ama garaaca aadka u gaaban, hoos u dhaca ballacana wuxuu horseedi karaa ballaarinta waqtiga; Waxaa sidoo kale jira kiisas halkaas oo ballaca garaaca garaaca ee garaaca xooggan uu gaabiyo marka ballaca uu cidhiidhi noqdo.